Typewriting machine



Mar. 27, 1923- G. W. CAMPBELL TYPEWRITING MACHINE Filed Sept. 24, 1919 Z SheCtS-ShEBU l I 1,450,018 G. W. CAMPBELL TYPEWRITING MACHINE Filed Sept. 24, 1919 2 sheets-sheet 2 N Mar. 27, 1923' a M U LI /l jgg Z$20 2;

' inafter appear.

Patented Mar. 27, 1923..

UNITED STATES PATENT. OFFICE.

GEORGE w. CAMPBELL, or HARTFORD, comwn'crxcor, assrenon T UNDERWOOD TYPEWRITER COMPANY, or

NEW YORK, N. Y., A CORPORATION OF DELAWARE.

ryrnwnrrmc mnonmn.

Application filed September 24, 1919. Serial No. 325,928,

. chines of the class in which a central guide is provided near the printing point, and in which the type-bars have guiding projections at the types, Which are individually parallel with the types and all adapted to 15, enter said guide, which is usually placed vertically under the printing point. At the 'extremesides of the type-bar system, this central guide is not so efiicient as y it is with the type-bars at the middle of the system; and an object ofthe invention is therefore to provide means for more efliciently guiding a few of the type-bars at the extreme sides of the system. To this end,

there is provided an auxiliary type-bar guide on each side of the usual central typeuide. One auxiliary type-bar guide serves or say four type-bars atone side of the system, and the auxiliary guide at the other side serves for the same number of typebars at the other side of the system. The

types which are mounted upon these side type-bars are not provided with projecting guides or lugs, and hence are not guided by said central guide; but the side type-bars themselves are adapted to enter the auxiliary guides. These auxiliary'guides control. the

' tendency of these side bars to vibrate laterally,-'and they may be simply and inexpensively formed upon the bracket which 4 holds the central type-guide.

n Other features and advantages will here- In' the accompanying drawings, 7 Figure 1 is'a centralsectional elevation .of a typewriting machine of the portable front-strikeclass, embodying the present improvements. i

Figure 2 is apersp'ective side view of the central type-guide provided with auxiliary guides for some of the side type-bars. Figure 3 isa plan of the type system,

type-guiding. devicefand platen. 1 F iguref4= is a front elevationof the typeguide and a portion of the type-bar segment,

residing in inately at the lower-ends of the -type blocks.

showing particularly the arrangement of the side vtype-bars.

Figure 5 is a similar View to illustrate the manner in which most of the type-bars are guided in the usuahcentral. guide.

Figure 6 is a diagram to illustrate one of the four left-hand type-bars in its printing position. 1

The machine comprises the usual banks of keys 10 mounted upon levers 11, which have pin-and-Slot connections 12 with bellcranks 13, the latter connected by links 14 to the type-bars 15, all mounted upon a fulcrum rod 16, which is fixed in a segment 17,.

the latter having radial slots 18 in which the type-bars work. All the type-bars are provided with type blocks 19 secured thereon,

or three types 20.

each block usually carryin The type blocks are usually soldered upon the free ends of the type-bars. At each of these type-blocks or types is a projecting guide or fin 21 which is formed on the type 'bar and is parallel with the type, and which,

whenth'e type is in printing position, F igure 5, occupies a slotted central guide 22, which is mounted upon a fixed bracket '23 placed just below the printing point on the platen 24, said bracket being secured to the segment 17 by means of screws 25. At F ig ure 5 the guiding projection 21 upon the type is seen as held between the jaws of the type-guide 22. About three-fourths of the type-bars are guided in this manner; the types being bent at progressively increasing angles to the type-bars, as seen at Figure 3, so that all of the types and the guiding projections when in printing position stand vertically, as at Figure 5, even. though the type-bars radiate at different an les. In the printing position, as shown in igure 5, the bends in the type-bars 15 occur approxitype blocks 19, while the guidesf21 project below the For the four-bars 15*" lat the extreme ends of the type-bar system, the guiding projections 21 are omitted from the types, and the central type-guidej22is thereforenot used.

For these bars there are provided two auxiliary guides 26, -between ;the jaws of which the bodies of the type-barsenter, as at Fi ure 4. Each type-bar body may, if desir be formed with. a projection or widening27 toenter the guide, and this flat projecting 7 portion of the type-bar may be slightly ate substantially from the printing point,

and the auxiliary guides 26 engage these type-bars 15* between the bends therein and the pivot 16, but close to the bends, as

shown in Figure 4a The auxiliary guides 26 are shown as risers on and may form a fork extending up from the main guiding bracket 23, and may have diagonal slots 28 corresponding to the positions of the type-bars which enter the same; that is, these auxiliary slots diverge substantially radially downwardly and outwardly from about the printing point.

It will be seen that the auxiliary guides overcome the tendency of the type-bars to rattle or spring laterally,or to twist, so that better printing and more satisfactory operation are secured. a

Variations may be resorted to within the scope of the invention, and portions of the im rovements may be used without others.

aving thus described my invention, I- claim:

1. In a front-strike typewriting machine, the combination with a system of pivoted type-bars, of a three-part type-guide, comprising a central part to" guide the middle type-bars in the system, said central part being positioned below the printing point, and the middle type-bars being provided at the types with projections in line therewith and at angles to the bars, to enter said central part, and opposite guiding parts above the central part, at the sides thereof,

near the printing point and to be directly engaged by type-bars at the sides of the system. a

2. In a front-strike typewriting machine, the combination with a system of pivoted type-bars, of a central type-guide for the. main portioniof the type-bars in the system, said central guide being in a line with the types at the printing point, and said main type-bars having at their types guidingpro'ections extending therefrom to enter sai guide, and type-bar guides near the printing point and at the sides of said central type-guide and auxiliary thereto, to be directly engageable by t pe-bars at the sides of the system, said si e type-bars having bends at their type ends, and said auxiliary guides being engalgeable by said typejibars between said bends andthe type-bar pigots.

3.. In a front-strike 'typewriting machine,

the combination with a system of ivoted type-bars, of a central type-guideftor the main portion of the type-bars in the system, said central guide being in a line with the types at the printing point, and said main type-bars having at their types guiding pro'ections extending therefrom to enter sai -guide,-type-bar guides near the printing point and at the sides of said central type-guide and auxiliary thereto, to be directly engageable by type-bars at the sides of the system, abracket upon which said central guide is mounted, and risers on said bracket at the sides of said central-guide, and provided with jaws to form said auxiliary guides.

4. In a front-strike typewriting'machine, the combination with a system of pivoted type-bars, of a central type-guide for the main portion of the type-bars in the system, said central guide being in a line with the types at the printing point, and said main.

type-bars having at their types guidingprojections extending therefrom to enter said guide, type-bar guides near the printing point and at the sides of said central type-guide and auxiliary thereto, to be directly engageable by type-bars at the sides of the system, a bracket upon which said central guide is mounted, andrisers on said bracket, at the sides of said central guide, and provided with jaws to form said auxiliary guides, said jaws inclining about radially of the printing point.

5.- In afront-strike the combination with a system of pivoted type-bars, of a\three-part type-guide comprising a central part to guide the middle type-bars .in the system, said central part having a vertical slot below the printing point, and the middle type-bars being provided at their types with projections in'line typewriting machine therewith and at angles to the bars to enter said slot of the central part, and opposite guiding parts above the central part and at the .sides thereof and comprising slots to" receive directlythe type-bars at the sides of a the s stem. g

6. n a front-strike typewritingmachine, the combination with a'system of pivoted type-bars, of a central type-guide for the main portion of the type-bars in thes'ystem, said central guide being in'aline with the types at the printing point, and said main type-bars having at their types'guiding projections extending therefrom to enter said guide, printing point and at the sides of said central type-guide and auxiliary thereto, to,

and type-bar guides near the the combination'with a system of pivoted type-bars, of a central type-guide for the main portion of the type-bars in the system,'

said central guide being in a line-With the types brought to the printing point, and the type-bars of said main portion having type-blocks set at such angles thereon as to be in alignment with the central guide,-

so that guiding projections extending from the type-bars at their type-blocks and in line therewith will enter said guide, and type-bar guides near the printing point and at the sides of said central type-guide and auxiliary thereto, to be directly engage'able by type-bars at the extreme sides of the system, the last-mentioned type-bars having type-blocks thereon arranged to come to a substantially vertical printing position and having bends so positioned at their typeends that, when swung to their printing positions, said auxiliary guides will be engaged thereby between said bends and the type-bar pivots and near to said bends.

GEORGE W. CAMPBELL.

Witnesses:

MARTHA L. STINNS, EDWARD AMERMAN. 

